Search results for "cuba"
showing 10 items of 340 documents
Il filo del racconto
2009
Intorno a questioni di centrale rilevanza, quesiti e situazioni che chiamano in gioco l’uomo nella sua essenza, interrogativi che dividono perché mettono a confronto posizioni radicali, il testo interroga i drammaturghi del passato cercando individuare nei miti da loro messi in scena, forme di attualizzazione e/o elementi di radicale alterità con la nostra esperienza quotidiana. I personaggi di Antigone ed Ecuba rappresentano, in tal senso, figure emblematiche per esplorare, attraverso una prospettiva letteraria, socio-giuridica e comunicativa, il nesso che lega sapere e potere, il conflitto tra dimensione individuale e assetto giuridico, il rapporto tra soggettività e coscienza collettiva.…
Effect of different cryopreservation protocols on the metaphase II spindle in human oocytes.
2008
The aim of this study was to evaluate the impact of different cryopreservation protocols on the repolymerization of metaphase (M)II spindles in human oocytes. Fresh aspirated donor oocytes were cryopreserved 3–4 h after retrieval using four different protocols: slow freezing using 1.5 mol/l 1,2-propanediol (PROH) + 0.2 mol/l sucrose (n = 36); 1.5 mol/l PROH + 0.3 mol/l sucrose (n = 34); 1.5 mol/l PROH + 0.3 mol/l sucrose with Na + depleted–choline replaced media (n = 27), and vitrification by the Cryotip method (n = 23). The control group comprised 34 fresh oocytes. Three hours after thawing, surviving and control oocytes were fixed for meiotic spindle/chromatin assessment. Survival rates w…
La lógica internacional de la vía chilena al socialismo, cincuenta años después
2021
The electoral victory of the Chilean Popular Unity (UP) in 1970, in a continent under major tension since 1959, propitiated the attempt to open a new path to socialism without armed struggle, but ended with a military coup in 1973. This article aims to review the various readings of what happened under the presidency of S. Allende and to explain how the Chilean process revalued the concept of democracy internationally, giving it a content that continues to this day. La victoria electoral de la Unidad Popular (UP) chilena en 1970, en un continente hipertensionado desde 1959, propició el intento de abrir una nueva vía al socialismo sin lucha armada, pero acabó con un golpe militar en 1973. Es…
The influence of pulsed redox conditions on soil phosphorus
2010
Abstract. The effects of eleven pulsed reduction-oxidation cycles (20 and 2 days, respectively) on soil phosphorus (P) dynamics are compared for 12 soils having contrasting properties and overfertilised with respect to P. Incubation conditions simulated transient waterlogging of the soil profile and involved repeated sampling and analysis of both the solution and solid phase P forms. An initial increase in P concentration occurred upto and including the fourth full cycle was followed by a sharp decline in concentration for all but one soil. Accompanying changes in the main extractable forms of P, which appeared to be cumulative, could be summarised as a general decline in the organic P frac…
Deconstructing incubation behaviour in response to ambient temperature over different timescales
2021
Avian embryos need a stable thermal environment to develop optimally, while incubat-ing females need to allocate time to self-maintenance off the nest. In species with female-only incubation, eggs are exposed to ambient temperatures that usually cool them down during female absences. The lower the ambient temperature the sooner females should return to re-warm the eggs. When incubation constraints ease at increasing ambient temperatures, females respond by increasing either incubation effort or self-maintenance time. These responses are population-dependent even within the same species; but it is uncertain whether they are caused by local environmental conditions or they are an artefact fro…
CCDC 910389: Experimental Crystal Structure Determination
2013
Related Article: Y.Inokuma,S.Yoshioka,J.Ariyoshi,T.Arai,Y.Hitora,K.Takada,S.Matsunaga,K.Rissanen,M.Fujita|2013|Nature (London)|495|461|doi:10.1038/nature11990
Noticias del botánico aragonés Baltasar Boldó
2018
Conocidos hoy los trabajos naturalísticos de Baltasar Boldó, traemos aquí varias noticias nuevas de su paso por la Universidad de Zaragoza y por la isla de Cuba. / Although the Naturalist work of Baltasar Boldó is already well-known, we bring new news of his stay both in the Universidad de Zaragoza and Cuba.
Il processo di incubazione per la creazione di imprese vitali. Il caso del Consorzio ARCA
2013
Obiettivi . Il processo di creazione di nuove imprese risulta particolarmente complesso qualora parta da idee altamente innovative che trovano difficolta ad essere percepite come valide dai sovra sistemi. Obiettivo del presente lavoro e dimostrare che gli incubatori accademici svolgono un ruolo determinante per la vitalita di queste imprese. Metodologia . Attraverso un caso studio contraddistinto da un embedded design si analizza l’efficacia del processo di incubazione degli spin-off dell’incubatore del Consorzio Arca. Risultati . L’efficacia del processo di incubazione e dimostrata dall’elevato numero di spin-off che, al termine del periodo di incubazione, sono capaci di competere con succ…
Comparative cytotoxicity study of enniatins A, A1, A2, B, B1, B4 and J3 on Caco-2 cells, Hep-G2 and HT-29
2011
Abstract Enniatins (ENs) are ionophoric, phytotoxic, antihelminthic, and antibiotic compounds of hexadepsipeptidic structure produced by several strains of Fusarium spp. The cytotoxicity effect of the ENs A, A 1 , A 2 , B, B 1 , B 4 and J 3 was compared on three tumor cell lines, the human epithelial colorectal adenocarcinoma (Caco-2), the human colon carcinoma (HT-29), and the human liver carcinoma (Hep-G2). The endpoint evaluated was the mitochondrial integrity by using the MTT assays, after 24 and 48 h of incubation. The IC 50 value for EN A 2 on Caco-2 cells, after 24 h exposure, was 18.7 ± 4.5 μM and decrease to 2.6 ± 0.7 μM at 48 h of incubation. However, ENs A, A 1 , B 1 and B 4 exer…
Copper(I) Halides (X = Br, I) Coordinated to Bis(arylthio)methane Ligands: Aryl Substitution and Halide Effects on the Dimensionality, Cluster Size a…
2014
Bis(phenylthio)methane (L1) reacts with CuI to yield the 1D-coordination polymer [{Cu4(μ3-I)4}(μ-L1)2]n (1) bearing cubane Cu4I4 clusters as connecting nodes. The crystal structures at 115, 155, 195, and 235 K provided evidence for a phase transition changing from the monoclinic space group C2/c to P21/c. The self-assembly process of CuI with bis(p-tolylthio)methane (L2), bis(4-methoxyphenylthio)methane (L3), and bis(4-bromo-phenylthio)methane (L4) affords the 1D-coordination polymers [{Cu4(μ3-I)4}(μ-Lx)2]n (x = 2, 3, or 4). Compounds 2 and 4 are isostructural with C2/c low temperature polymorph of 1, whereas the inversion centers and 2-fold axes are lost in 3 (space group Cc). The use of b…